feat: jsdocs for generated types, by using admin.description (#9917)

This makes use of admin.description to generate JSDocs for field,
collection and global generated types.


![image](https://github.com/user-attachments/assets/980d825f-49a2-426d-933a-2ff3d205ea24)


![image](https://github.com/user-attachments/assets/d0b1f288-1ea1-4d80-8c05-003d59a4e41a)

For the future, we should add a dedicated property to override these
JSDocs.

You can view the effect of this PR on our test suite generated types
here:
05f552bbbc

test/plugin-seo/payload-types.ts

@@ -90,6 +90,9 @@ export interface Page {
   meta: {
     title: string;
     description?: string | null;
+    /**
+     * Maximum upload file size: 12MB. Recommended file size for images is <500KB.
+     */
     image?: (string | null) | Media;
     ogTitle?: string | null;
   };
@@ -146,6 +149,9 @@ export interface PagesWithImportedField {
       description?: string | null;
     };
     innerMedia?: {
+      /**
+       * Maximum upload file size: 12MB. Recommended file size for images is <500KB.
+       */
       image?: (string | null) | Media;
     };
   };